11 N-Methyl-o-toluidine 4.65 23 .0100 4.62 .00 4.62 .014 4.59 12 m-Toluidine 4.72 25 .0100 4.69 .00 4.69 .014 4.69 4.71°1 3 N-Ethyl-o-toluidine 4,99 22.5 .0040 4.96 .00 4.96 .015 4.92 14 N-Methyl-m-toluidine 5.03 21 .0100 5.00 .00 5.00 .015 4.94 15 a-Hydroxy-j9-ethylpyridine 5.03 25 .0100 5.00 .00 5.00 .015 5.00

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for many helpful ideas and discussions. We are indebted to Professor E. O. Lawrence and the members of the Radiation Laboratory for their interest and cooperation. Thanks are also due to the Rockefeller Foundation for support to the Radiation Laboratory.

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The determination of the (Ph)HAo value of 0.2 M trichloro-acetic acid gave: electrometric -0.1; colorimetric +0.5 with both types of indicators. 7 Ref. 4 and other papers.

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